On Fri, 18 Mar 2005 11:14:45 -0800, Andy wrote in message <[EMAIL PROTECTED]>:
> Josh Babcock wrote: > > OK, here's the file: > > http://home.comcast.net/~jrbabcock/superfort/b29-yasim.xml > > Some random notes, before I start running it: > > The inbord and outboard engines don't match. Your inbord ones are > defined to produce 2200 HP at 1000 RPM (which is *monster* engine), > while your outboard ones get 2200 at 2900 RPM (a little over 1/3 the > power of the others). The inboard ones look typoed to me. > > I see that all your propellers have a gear-ratio="0.35" setting. This > is almost certainly wrong. The B-29 used big cylinder radials, and as > far as I know no one ever made one of these with with a gearing system ..no? Those late and post WWII big ass corncobs were all geared, to stay as small as possible. ;o) > (no point, as pistons that size can't be made to move much faster). > Note also that this doesn't match your (outboard) engine settings. > You have a propeller that wants to sink 1800 HP at 2200 RPM. But at > that speed the engine would be turning at a shaft-melting 6285 RPM. > > The props also have buggy settings for their controller levers. The > are "power-calibrated" at 2200 RPM, which matches the engine settings > you have. But the max-rpm value is only 1200, so the governor will > never allow them to turn that fast. ..those B-29 props was spun at 910 rpm by 2200 T/O and military ponies spinning the crank shaft at 2600 rpm. http://www.wpafb.af.mil/museum/research/bombers/b3-30.htm http://www.google.com/search?num=100&q=B-29+R-3350+rpm+%22gear+ratio%22&ie=UTF-8&oe=UTF-8 > I'll try these changes as soon as I get a chance and see what happens. > > Andy > > > _______________________________________________ > Flightgear-devel mailing list > [email protected] > http://mail.flightgear.org/mailman/listinfo/flightgear-devel > 2f585eeea02e2c79d7b1d8c4963bae2d > -- ..med vennlig hilsen = with Kind Regards from Arnt... ;o) ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. _______________________________________________ Flightgear-devel mailing list [email protected] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
